Used by an application to indicate
on which monitor chain its monitor buffers are being registered. The accepted
values for this parameter vary for each device driver. See information on
the physical mouse device driver, the physical keyboard device driver and
the physical parallel port device driver in the OS/2 Input/Output Device
Driver Reference to determine the valid parameter value for each device
driver.
Refer to the descriptions of the DosMonReg, DosMonRead, and DosMonWrite
functions in the OS/2 Control Program Programming Reference for more
information.